docs: def get_std_dev_mag(self, rake):
          """
          Standard deviation on the magnitude for the WC1994 area relation.
          """
          assert rake is None or -180 <= rake <= 180
          if rake is None:
              # their "All" case
              return 0.24
          elif (-45 <= rake <= 45) or (rake >= 135) or (rake <= -135):
              # strike slip
              return 0.23
          elif rake > 0:
              # thrust/reverse
              return 0.25
          else:
              # normal
              return 0.25